Are infrared dark clouds really quiescent?

S. Feng; H. Beuther; Q. Zhang; Th. Henning; H. Linz; S. Ragan; R. Smith

doi:10.1051/0004-6361/201526864

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Volume 592 (August 2016)

A&A, 592 (2016) A21

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Table 3

IRAM 30 m observations on the four IRDCs.

Source	RA	Dec	Abbrev.	Source	RA	Dec.	abbrev.
	[J2000]	[J2000]			[J2000]	[J2000]

G28.34 S			G28.34 S	IRDC 18530			18530
IRDC 18306			18306	IRDC 18308			18308

Date^a	Source	Pointing	Focus	T_sys ^b		τ_{225 GHz} ^b
(yyyymmdd)				1 mm (K)	3 mm (K)

20140528	G28.34 S, 18530	Saturn, K3-50A, Venus, 1749+096	Saturn, Venus	450–550	115–130	0.5–0.6
20140529	18306, 18530	Saturn, K3-50A, 1749+096	Saturn	270–310	90–110	0.2–0.4
20140530	18306, 18308	Saturn, 1749+096	Saturn	275–285	90–100	0.2–0.4
20140531^∗	G28.34 S, 18306, 18308	W3OH, 1749+096	W3OH	210–280	90–110	0.1–0.3

Notes.

^(a)

“*” denotes the date when observational bands were tuned from 85.8–93.6 GHz to 85.2–92.9 GHz, and from 215.1–222.8 GHz to 217.0–224.8 GHz.

^(b)

T_sys and τ are averaged system temperature and precipitable water vapor in each observation.

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